Determine the equivalent capacitance of the combination shown when C = 45 ?F.
A. 36 ?F
B. 32 ?F
C. 34 ?F
D. 30 ?F
E. 38 ?F
Answer: D
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If an extrasolar planet suddenly became more massive, but kept the same radius and orbit, what would change in the observed Doppler shift of the star?
A) The peak velocity of the star would be faster. B) The time between peaks in the velocity of the star would decrease. C) The time between peaks in the velocity of the star would increase. D) The shape of the velocity curve would become less symmetric. E) Nothing. The mass of a planet does not affect the Doppler shift.
A resistor, R, is made out of a particular material with resistivity P. The cylindrically shaped resistor has length I and radius r. To get four times as much resistance in your resistor you could
1.make the radius four times as big. 2.make the radius half as big. 3.make the radius one quarter the size. 4.make the radius twice as big.
A 60-mC charge is held fixed at the origin and a -20-mC charge is held fixed on the x axis at a point x = 1.0 m. If a 10-mC charge is released from rest at a point x = 40 cm, what is its kinetic energy the instant it passes the point x = 70 cm?
a. 9.8 J b. 7.8 J c. 8.8 J d. 6.9 J e. 2.8 J
Calculate the concentration of vacancies in silicon at the solid-liquid equilibrium temperature of 1683 K where single crystals of silicon are grown. The enthalpy of formation for vacancies in silicon is 2.3 eV/vacancy.
What will be an ideal response?